JPH0270371A - Gravity casting method - Google Patents
Gravity casting methodInfo
- Publication number
- JPH0270371A JPH0270371A JP21968988A JP21968988A JPH0270371A JP H0270371 A JPH0270371 A JP H0270371A JP 21968988 A JP21968988 A JP 21968988A JP 21968988 A JP21968988 A JP 21968988A JP H0270371 A JPH0270371 A JP H0270371A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- mold
- gate
- cavity
- gate part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims description 7
- 230000005484 gravity Effects 0.000 title claims description 5
- 239000002184 metal Substances 0.000 claims abstract description 37
- 239000000696 magnetic material Substances 0.000 claims abstract description 6
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 239000003302 ferromagnetic material Substances 0.000 abstract description 8
- 230000005291 magnetic effect Effects 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、磁界の変化を利用した重力鋳造方法の改良に
関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a gravity casting method using changes in a magnetic field.
（従来の技術）
一般に、鋳物（例えばピストン）を鋳造する場合、鋳型
のキャビティ内において凝固する製品部分とゲート部（
押し湯部）内において凝固する部分との境界付近すなわ
ち連接部分付近にピンホールや引は巣等が発生すること
が多い。(Prior Art) Generally, when casting a casting (for example, a piston), the product part solidifies in the mold cavity and the gate part (
Pinholes, cavities, etc. often occur near the boundary with the solidifying part (in the riser part), that is, near the connecting part.
ところで、鋳物の結晶粒径を細かくしホットティア−を
防止するために、例えば特開昭５５−１３６５５８号公
報に記載されるように、鋳型の外壁から内壁を貫通する
棒状の超音波伝達体をもつ鋳型に、溶湯を鋳込み、超音
波伝達体を介して溶湯に超音波を印加するようにしたも
のは知られている。By the way, in order to reduce the crystal grain size of the casting and prevent hot tears, a rod-shaped ultrasonic transmitter that penetrates from the outer wall to the inner wall of the mold is used, as described in JP-A-55-136558, for example. There is known a mold in which molten metal is poured into a mold and ultrasonic waves are applied to the molten metal via an ultrasonic transmitter.
また、上述したピンホールや引は巣等の発生を抑制する
ために、鋳型そのものに振動を与えることも知られてい
る。It is also known to apply vibration to the mold itself in order to suppress the occurrence of pinholes, cavities, etc. mentioned above.
（発明が解決しようとする課題）
ところが、そのようなものは、いずれも、結果として溶
湯を単に振動させるだけであるので、溶湯の凝固を時間
的に遅らせることはできず、鋳型のゲート部とキャビテ
ィとの連接部分に生じやすいひけ巣やピンホール等の発
生防止に十分な効果を発揮できない。(Problem to be Solved by the Invention) However, all of these methods simply vibrate the molten metal, so they cannot temporally delay the solidification of the molten metal, and the gate part of the mold and It is not sufficiently effective in preventing the occurrence of shrinkage cavities, pinholes, etc. that tend to occur at the joint with the cavity.
本発明はかかる点に鑑みてなされたもので、鋳型のゲー
ト部とキャビティとの連接部分に生じやすいひけ巣やピ
ンホール等を防止することができる重力鋳造方法を提供
することを目的とするものである。The present invention has been made in view of the above points, and an object of the present invention is to provide a gravity casting method that can prevent shrinkage cavities, pinholes, etc. that are likely to occur at the joint between the gate part of the mold and the cavity. It is.
（課題を解決するための手段）
本発明は、上記目的を達成するために、ゲート部周囲に
電磁コイルが配設された鋳型に注湯した後、上記ゲー′
ト部の電磁コイルに対し磁性体を挿通し、それから電磁
コイルに電流を流し、鋳型のキャビティ内の溶湯の凝固
後にゲート部の溶湯を凝固させることを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention provides that after pouring metal into a mold in which an electromagnetic coil is arranged around a gate part,
The method is characterized in that a magnetic material is inserted into the electromagnetic coil in the gate section, and then a current is passed through the electromagnetic coil to solidify the molten metal in the gate section after solidifying the molten metal in the cavity of the mold.
すなわち、本発明は、磁性体が挿通された電磁コイルに
電流を流すことにより生じる磁界の変化を利用せんとす
るものである。That is, the present invention aims to utilize changes in the magnetic field caused by passing a current through an electromagnetic coil through which a magnetic material is inserted.
（作用）
鋳型のゲート部の電磁コイル内に磁性体を挿入して、電
磁コイルに電流を流すことによる電磁撹拌と、それによ
る磁界変化に伴うヒステリシス損失による熱で、鋳型の
ゲート部とキャビティとの連接部分を含めてゲート部に
おける溶湯は、キャビティ内における溶湯よりも凝固す
るのが遅延せしめられる。(Function) A magnetic material is inserted into the electromagnetic coil at the gate of the mold, and the electromagnetic stirring produced by passing a current through the electromagnetic coil and the heat generated by the hysteresis loss caused by the magnetic field change cause the gate and cavity of the mold to interact. The molten metal in the gate portion, including the connecting portion of the molten metal, solidifies more slowly than the molten metal in the cavity.
（実施例） 以下、本発明の実施例を図面に沿って詳細に説明する。(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.
図面において、１はピストンを鋳造するための鋳型（金
型）で、上型２、下型３、及び側型４゜５とからなる。In the drawings, reference numeral 1 denotes a mold (metal mold) for casting a piston, which consists of an upper mold 2, a lower mold 3, and a side mold 4.5.
一方の側型４に湯口６が形成され、他方の側型５にゲー
ト部７が形成されている。A sprue 6 is formed in one side mold 4, and a gate portion 7 is formed in the other side mold 5.
上記他方の側型５のキャビティ１１との連接部付近のゲ
ート部７周囲の壁部には電磁コイル１０が埋設されてい
る。An electromagnetic coil 10 is embedded in the wall around the gate part 7 near the connecting part with the cavity 11 of the other side mold 5.
上記鋳型１（側型５）のゲート部７には、注湯後、上記
電磁コイル１０に対し、強磁性体１２（例えば棒鋼）が
略完全な挿通状態となるまで挿通され、その状態で電磁
コイル１０に電流を流してキャビティ１１内における溶
湯の凝固の後に、キャビティ１１との連接部分も含めて
ゲート部７における溶湯を凝固させることができるよう
になっている。After pouring the metal into the gate part 7 of the mold 1 (side mold 5), a ferromagnetic material 12 (for example, a steel bar) is inserted into the electromagnetic coil 10 until it is inserted almost completely, and in that state, the electromagnetic After the molten metal in the cavity 11 is solidified by passing current through the coil 10, the molten metal in the gate portion 7 including the portion connected to the cavity 11 can be solidified.
続いて、上記鋳型１を用いて行う重力鋳造方法について
、詳細に説明する。Next, a gravity casting method using the mold 1 will be described in detail.
まず、上型２、下型３、及び側型４．５を全て組付けて
鋳型１を形成する。First, the upper mold 2, the lower mold 3, and the side molds 4.5 are all assembled to form the mold 1.
それから、湯口６から、所定量だけ溶湯を注湯し、その
後、ゲート部７の中心部分付近における溶湯内に細い棒
状の強磁性体１２を挿入し、キャビティ１１との連接部
分まで挿通ずる。Then, a predetermined amount of molten metal is poured from the sprue 6, and then a thin rod-shaped ferromagnetic body 12 is inserted into the molten metal near the center of the gate part 7, and is passed through until it connects with the cavity 11.
これにより、強磁性体１２が電磁コイル１０の内部に完
全に挿通された状態となる。As a result, the ferromagnetic material 12 is completely inserted into the electromagnetic coil 10.
しかして、電磁コイル１０に対して電流を流すと、電磁
コイル１０内に強磁性体１２が挿通された状態となって
いるので、上記連接部分における磁界が変化し、その磁
界変化によるヒステリシス損失により熱が発生して、溶
湯が凝固しないように融点以上の温度を維持するととも
に、電磁撹拌により強磁性体１２付近の熱せられた溶湯
が周囲に徐々に拡散し、その付近の凝固された部分は破
壊され、その結果として、上記連接部分において溶湯の
凝固が進行せず、キャビティ１１の部分よりも凝固が遅
れる。When current is applied to the electromagnetic coil 10, since the ferromagnetic material 12 is inserted into the electromagnetic coil 10, the magnetic field at the connected portion changes, and hysteresis loss due to the magnetic field change causes Heat is generated and the temperature is maintained above the melting point so that the molten metal does not solidify, and the heated molten metal near the ferromagnetic material 12 gradually diffuses into the surroundings by electromagnetic stirring, and the solidified portion in the vicinity As a result, solidification of the molten metal does not proceed in the connecting portion, and solidification is slower than in the cavity 11 portion.
このように、ゲート部７の溶湯は、強磁性体１２の周囲
において、キャビティ１１の溶湯よりも凝固が遅れるこ
ととなるので、その凝固が遅れる部分を通じて、ピンホ
ールや引は巣等の原因となるガス等が外部へ排出され、
ゲート部７とキャビティ１１と連接部分に対応する部分
に発生しやすいひけ巣やピンホール等が除去される。In this way, the molten metal in the gate portion 7 solidifies more slowly than the molten metal in the cavity 11 around the ferromagnetic material 12, so that pinholes, shrinkage cavities, etc. can occur through the areas where the solidification is delayed. gases etc. are discharged to the outside,
Shrinkage cavities, pinholes, etc. that tend to occur in the portions corresponding to the connecting portions of the gate portion 7 and the cavity 11 are removed.
しかして、キャビティ１１内の溶湯が凝固した後に、強
磁性体１２をゲート部７の溶湯内より弓き抜くことによ
り、ゲート部７内の溶湯もキャビティ１１内の溶湯に遅
れて凝固する。。After the molten metal in the cavity 11 has solidified, the ferromagnetic material 12 is extracted from the molten metal in the gate part 7, so that the molten metal in the gate part 7 also solidifies later than the molten metal in the cavity 11. .
なお、上記鋳型１のゲート部７に配設する電磁コイル１
０は、円周状に配置すれば、溶湯には渦巻状の流れが生
ずるし、２極として交互に極を切替えるようにすれば、
該両極間における溶湯の往復の流れを生じるようになる
等、電磁コイル１０の配置により溶湯の流れを変化させ
ることができる。In addition, the electromagnetic coil 1 disposed in the gate part 7 of the mold 1
If 0 is arranged circumferentially, a spiral flow will occur in the molten metal, and if the poles are alternately switched as two poles,
The flow of the molten metal can be changed by arranging the electromagnetic coil 10 such that the molten metal flows back and forth between the two poles.
（発明の効果）
本発明は上記のように構成したから、磁性体が挿通され
た電磁コイルに電流を流すことによる電磁撹拌及び、該
電磁撹拌に伴うヒステリシス損失により発生する熱で上
記ゲート部の溶湯を遅延凝固させることができ、ゲート
部とキャビティとの連接部分に生じやすいひけ巣やピン
ホールを防止することが可能となる。(Effects of the Invention) Since the present invention is constructed as described above, the gate portion is heated by electromagnetic stirring caused by passing a current through an electromagnetic coil through which a magnetic material is inserted, and by heat generated by hysteresis loss accompanying the electromagnetic stirring. The molten metal can be solidified in a delayed manner, and it is possible to prevent shrinkage cavities and pinholes that are likely to occur in the joint between the gate and the cavity.
図面は本発明を実施するのに用いる鋳型の一例を示す断
面図である。
１・・・・・・鋳型、６・・・・・・湯口、７・・・・
・・ゲート部、１０・・・・・・電磁コイル、１２・・
・・・・強磁性体、ほか２名The drawing is a sectional view showing an example of a mold used to carry out the present invention. 1... Mold, 6... Sprue, 7...
...Gate part, 10... Electromagnetic coil, 12...
...Ferromagnetic material, and 2 others
Claims (1)
湯した後、上記ゲート部の電磁コイルに対し磁性体を挿
通し、それから電磁コイルに電流を流し、鋳型のキャビ
ティ内の溶湯の凝固後にゲート部の溶湯を凝固させるこ
とを特徴とする重力鋳造方法。(1) After pouring the metal into a mold with an electromagnetic coil arranged around the gate, a magnetic material is inserted into the electromagnetic coil in the gate, and then a current is passed through the electromagnetic coil, causing the molten metal in the mold cavity to flow. A gravity casting method characterized by solidifying the molten metal at the gate after solidification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21968988A JPH0270371A (en) | 1988-09-02 | 1988-09-02 | Gravity casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21968988A JPH0270371A (en) | 1988-09-02 | 1988-09-02 | Gravity casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0270371A true JPH0270371A (en) | 1990-03-09 |
Family
ID=16739424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21968988A Pending JPH0270371A (en) | 1988-09-02 | 1988-09-02 | Gravity casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0270371A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013049082A (en) * | 2011-08-31 | 2013-03-14 | Honda Motor Co Ltd | Apparatus and method for casting |
| JP2016095127A (en) * | 2012-10-15 | 2016-05-26 | アップル インコーポレイテッド | Inline melt control via rf power |
| US9873151B2 (en) | 2014-09-26 | 2018-01-23 | Crucible Intellectual Property, Llc | Horizontal skull melt shot sleeve |
-
1988
- 1988-09-02 JP JP21968988A patent/JPH0270371A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013049082A (en) * | 2011-08-31 | 2013-03-14 | Honda Motor Co Ltd | Apparatus and method for casting |
| JP2016095127A (en) * | 2012-10-15 | 2016-05-26 | アップル インコーポレイテッド | Inline melt control via rf power |
| US9810482B2 (en) | 2012-10-15 | 2017-11-07 | Apple Inc. | Inline melt control via RF power |
| US10197335B2 (en) | 2012-10-15 | 2019-02-05 | Apple Inc. | Inline melt control via RF power |
| US9873151B2 (en) | 2014-09-26 | 2018-01-23 | Crucible Intellectual Property, Llc | Horizontal skull melt shot sleeve |
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